Multi-channel pulse Doppler radar capable of cross-medium detection of underwater sound source

Abstract

The invention discloses a multi-channel pulse Doppler radar capable of detecting an underwater sound source in a cross-medium manner, which relates to the field of radar detection. The radar comprises a multi-beam parabolic cylinder antenna module, a transceiving module, a signal processing module and a data processing module; wherein the receiving and transmitting module is used for receiving a target echo signal or transmitting a transmitting signal to a parabolic cylinder reflector of the multi-beam parabolic cylinder antenna module; the data processing module is used for completing radar control, data communication and echo display; and the signal processing module is used for processing different radial speeds of sea wave clutters and water surface micro-motion signals relative to the radar detection direction. The method comprises the following steps: extracting a signal of which the Doppler frequency is not zero from a target echo signal, namely a water surface micro-motion signal, so as to effectively distinguish sea wave clutters and target echoes; therefore, a technical foundation is laid for cross-medium detection of underwater sound sources by adopting water surface and air radars, so that cross-medium communication becomes possible.

Description

technical field [0001] The invention relates to the field of radar detection, in particular to a multi-channel pulse Doppler radar capable of detecting underwater sound sources across media. Background technique [0002] Currently, underwater sensors cannot share data with sensors on land because they both use different wireless signals that only work in their respective mediums. Airborne radio signals attenuate very quickly in water, while acoustic signals emitted by underwater devices mostly reflect below the surface and are not transmitted into the air. For example, if an underwater submarine passes under an airplane in the air, the airplane has no way to detect its existence and communicate with each other without the submarine surfacing, and surfacing will endanger the safety of the submarine itself and expose the location of the submarine. [0003] In 2019, researchers at the Massachusetts Institute of Technology devised a system that allows data to be shared directly...

AI Technical Summary

Problems solved by technology

[0010] Considering the frequency and sound source level of the current underwater sound source, the displacement of the water surface fretting caused by the underwater sound source is only a dozen microns, and the wave displacement (peak-to-valley amplitude) is usually tens to hundreds of centimeters. FMCW radar cannot The water surface micro-motion signal superimposed on the waves is measured, that is, in the presence of waves, the FMCW radar cannot detect the underwater sound source across the medium

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